Karaoke Video Creator questions and issues

[Monster]

I use KVC to export text with a plain black background in order to import into Premiere Pro. I then remove the background in Premiere, but it's an imperfect removal. I would much rather export from KVC using a codec that supports alpha channel so that the text is over a transparent background. Several codecs support this.

I tried messing around with the "Additional FFMPEG settings" input but I couldn't get anything to work. I set a transparent PNG background and tried to export using prores, but it just fails immediately. It would be nice to see an error log that says why it failed.

Is this possible? If not, can it be added in the next version?

[Piotr]

This is very good suggestion, will see what can be done.

[Monster]

Any update?

[J0SHED]

I didn't have any of these problems with KVC. But the product is still worth updating and fixing the bugs that are now there.

[adam]

Do you refer to any particular bugs?

[Monster]

Not sure why "J0SHED" hijacked my thread. But I'm still curious if there's any update on this. Any of these possible?

• Adding the ability to use alpha channel as the background
• Explaining how I could do this using the "Additional FFMPEG settings" input
• Adding the ability to do this with the FFMPEG settings if it currently cannot

[Piotr]

It is coming pretty soon, matter of days, at most weeks.

[Monster]

Whoa, I am stoked by that news! Looking forward to it.

[Piotr]

Please try this build:

https://www.powerkaraoke.com/download/2 ... -setup.exe

You will find a new file format (WebM) and option to create videos with transparency. I have tested it with Shotcut and it works fine.

Please let me know if you find any problems.

[Monster]

I tried the build, but I'm not sure if it's working. I use these in Premiere Pro, which (unbelievably) doesn't support WebM format without a third-party plugin, which I installed. I couldn't get transparency to work, however. If I view the WebM in a browser, it's just black, the text won't even show. OBS Studio does the same thing, just black, so I don't think it's working.

Can we get an option for mov format using Apple Pro res 4444? That supports alpha channel, and it seems to be the standard for distributing alpha channel enabled video clips. WebM might work, but the current build does not seem to be outputting it properly.

[Monster]

OK, I messed around with Shotcut and found that the WebM I'm exporting from KVC is completely transparent, not just the background.

Here's the pk2: https://drive.google.com/file/d/1LX77C0 ... sp=sharing

[Piotr]

It did open with transparency on my machine, but I will provide even better option, you should be happy. Will post back in a day or two.

[Piotr]

Please try this build:

https://www.powerkaraoke.com/download/2 ... -setup.exe

Choose Custom output format, type mov as extension and the following as FFMPEG Settings:

Code: Select all

-c:v prores_ks -profile:v 4 -vendor apl0 -bits_per_mb 8000 -pix_fmt yuva444p10le 

It will create ProRes 444 with alpha video.

[Monster]

Same issue as with the WebM, the alpha channel is completely white. Except now the file size is humongous! I think the WebM will work fine though once the alpha channel is created properly, since I was able to view the channel in Premier Pro.

So you were able to create a video with a proper alpha channel using the project file I posted? Is there something I'm doing wrong?

UPDATE: I didn't check the bg transparency option when I exported the mov last time. I tried it again with that option and the video is just black, including the alpha channel, no lyrics are even showing up.

[Piotr]

OK, there was one issue that might have caused full white screen. Please try this one:

https://www.powerkaraoke.com/download/2 ... -setup.exe

Remember to switch to transparent background before generating the file.

WebM is transparent and I can test it in browser (download this .html file, change the webm video name there and give it a try):

https://www.powerkaraoke.com/download/2 ... /test.html

No browser on Windows will play transparent MOV, but you can use FFMPEG.exe to extract alpha channel from MOV file using this command:

Code: Select all

ffmpeg -i "file.mov"   -vf alphaextract,format=yuv420p output.mp4

ProRes file is huge, but it must be, as it uses lossless compression.